link to the paper extension

README.md

@@ -77,6 +77,10 @@ cargo criterion --output-format verbose --message-format json --package benches
 :point_right: this will create a `./results.ndjson` file
 
 ## Build the paper [[toc](#table-of-content)]
+> :bulb: **Note**
+>
+> there is also an extension of this paper available on the [`paper-extension` branch](https://gitlab.isae-supaero.fr/dragoon/pcs-fec-id/-/tree/paper-extension/paper?ref_type=heads)
+
 - download the figures at [this address](https://gitlab.isae-supaero.fr/dragoon/pcs-fec-id/-/raw/paper-resources/images.zip)
 - unzip the `.eps` files into `paper/images/`, e.g. with
 ```shell